CN110173295B - Method for extracting gas and preventing and extinguishing fire by using bedding directional drilling - Google Patents
Method for extracting gas and preventing and extinguishing fire by using bedding directional drilling Download PDFInfo
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- CN110173295B CN110173295B CN201910632444.XA CN201910632444A CN110173295B CN 110173295 B CN110173295 B CN 110173295B CN 201910632444 A CN201910632444 A CN 201910632444A CN 110173295 B CN110173295 B CN 110173295B
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- bedding
- directional drilling
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F5/00—Means or methods for preventing, binding, depositing, or removing dust; Preventing explosions or fires
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F7/00—Methods or devices for drawing- off gases with or without subsequent use of the gas for any purpose
Abstract
The invention discloses a method for extracting gas and preventing and extinguishing fire by using bedding directional drilling, belonging to a composite disaster prevention and control method for a coal mine. Drilling a drilling field in an air inlet roadway and an air return roadway of a stope face, then respectively constructing bedding directional drilling holes in coal seams outside the air inlet roadway and the air return roadway in the drilling field, enabling the bedding directional drilling holes to penetrate through coal walls outside the air inlet roadway and the air return roadway, and then performing gas extraction and fire prevention and extinguishing work in a goaf according to the following stages: in the first stage, the bedding directional drilling holes in a drilling field are sequentially utilized in the mining process of a stope face, and gas in a goaf is extracted in a negative pressure mode, so that the gas concentration is prevented from exceeding the limit in the mining process; and in the second stage, injecting fire-extinguishing materials into the goaf by sequentially utilizing the bedding directional drilling to prevent the spontaneous combustion of residual coal in the goaf. The method can realize the purposes of gas extraction and fire prevention and extinguishment by utilizing the bedding directional drilling in the process of exploiting the high-gas easily spontaneous combustion coal bed, is simple and convenient to operate, has high gas extraction rate and good fire prevention and extinguishment effect, and saves the engineering cost.
Description
Technical Field
The invention relates to a composite disaster prevention and control method for a coal mine, in particular to a method for extracting gas and preventing and extinguishing fire by using bedding directional drilling.
Background
The gas concentration of the goaf is over-limit and the residual coal is spontaneous combustion, which are important disasters affecting the safety production of coal mines, and particularly when a coal seam with high gas content and spontaneous combustion tendency of coal bodies is mined, serious accidents such as gas explosion and the like can be possibly induced.
At present, the main technical measure for preventing the gas concentration in the goaf from exceeding the limit is goaf buried pipe extraction, and the main measures for preventing spontaneous ignition of residual coal in the goaf are grouting, blocking slurry injection, gel injection, inert gas injection and the like for the goaf through pipelines. In addition, sometimes, cross-layer drilling is also constructed to extract gas in the goaf or inject fire prevention and extinguishing materials into the goaf.
However, no matter the pipeline is arranged in the goaf or the cross-layer drilling is carried out in the construction, the damage of rocks and the like caused by the caving of the top plate in the stoping process of the working face can be caused to different degrees, the normal use value of the cross-layer drilling cannot be exerted, and the practical problems of repeated drilling, low hole forming rate, difficult later maintenance and the like are easy to occur when the cross-layer drilling construction is carried out; meanwhile, the existing drilling and pipeline designed aiming at the gas concentration overrun of the goaf and the spontaneous combustion of the residual coal have single action and low utilization rate. This not only influences the normal clear of coal mine production work, but also greatly increased coal mining's cost.
Disclosure of Invention
The invention aims to solve the problems in the prior art and provides the method for extracting the gas and preventing and extinguishing fire by using the bedding directional drilling, which is simple and convenient to operate, high in gas extraction rate, good in fire prevention and extinguishing effect and capable of saving the engineering cost.
The purpose of the invention is realized as follows: drilling a drill site (4) in an air inlet roadway (2) and an air return roadway (3) of a stope face (1), constructing bedding directional drilling holes (6) in a coal bed (5) outside the air inlet roadway (2) and the air return roadway (3) in the drill site (4) respectively, enabling the bedding directional drilling holes (6) to penetrate out of coal walls outside the air inlet roadway (2) and the air return roadway (3), and then performing gas extraction and fire prevention and extinguishing work in a goaf (7) according to the following stages:
in the first stage, bedding directional drilling holes (6) in a drilling field (4) are sequentially utilized in the mining process of a stope face (1), and gas in a goaf (7) is extracted in a negative pressure mode, so that the gas concentration in the mining process is prevented from exceeding the limit;
and in the second stage, the bedding directional drilling holes (6) are sequentially utilized to inject fire prevention and extinguishing materials into the goaf (7), so that the spontaneous combustion of residual coal in the goaf (7) is prevented.
The distance between the drill sites (4) in the same roadway is 50-60 meters, and the drill sites are symmetrically arranged in the air inlet roadway (2) and the air return roadway (3) of the stope face (1).
And 5-6 bedding directional drilling holes (6) are constructed in each drilling field (4), and the horizontal distance of the final hole positions of the bedding directional drilling holes (6) in the same drilling field (4) is 6-10 meters.
And the vertical distance between the bedding directional drilling holes (6) in two adjacent drilling sites (4) in the same roadway is 0.5-1.5 m.
Has the advantages that: by adopting the scheme, 1, the gas in the goaf can be extracted and the fire prevention and extinguishing material can be injected into the goaf by using the bedding directional drilling, so that the utilization rate of the drilling is greatly improved, and the engineering cost is reduced; 2. the drill site and the bedding directional drilling holes are constructed in coal beds outside the air inlet roadway and the air return roadway of the working face, the drilling holes are not easy to damage, and normal mining of the working face cannot be influenced when goaf gas extraction and fire prevention and extinguishing measures are implemented.
The advantages are that: the method can achieve the purposes of gas extraction and fire prevention and extinguishment in the high-gas easily-inflammable coal seam, is simple and convenient to operate, has high gas extraction rate and good fire prevention and extinguishment effect, and saves the engineering cost.
Drawings
FIG. 1 is a plan view of a drill site and directional bedding hole placement prior to extraction at a stope face in accordance with the method of the present invention.
FIG. 2 is a side view of the drill site and directional bedding hole placement prior to extraction at a stope face in accordance with the method of the present invention.
FIG. 3 is a schematic diagram of the method for extracting the gas in the goaf by using the directional bedding drilling in the mining process of the stope face.
FIG. 4 is a schematic diagram of the method of the present invention for injecting fire-extinguishing materials into a goaf by directional bedding drilling in the mining process of a stope face.
In the figure: 1-stoping a working face; 2-air intake roadway; 3-return air tunnel; 4-drilling field; 5-coal bed; 6-directional bedding drilling; 7-goaf.
Detailed Description
The invention is suitable for coal seams with high coal seam gas content and spontaneous combustion ignition tendency, and the specific implementation mode of the invention is explained as follows:
the specific method comprises the following steps: a drill site (4) is dug in an air inlet roadway (2) and an air return roadway (3) of a stope face (1) at intervals of 50-60 meters, the drill sites (4) are symmetrically arranged in the air inlet roadway (2) and the air return roadway (3) of the stope face (1), then 5-6 bedding directional drill holes (6) are respectively constructed in coal seams (5) on the outer sides of the air inlet roadway (2) and the air return roadway (3) in the drill sites (4), the bedding directional drill holes (6) penetrate through coal walls on the outer sides of the air inlet roadway (2) and the air return roadway (3), the horizontal distance of the final hole positions of the bedding directional drill holes (6) in the same drill site (4) is 6-10 meters, and the vertical distance of the bedding directional drill holes (6) in two adjacent drill sites (4) is 0.5-1.5 meters.
In specific implementation, gas extraction and fire prevention and extinguishing work in the goaf (7) is carried out according to the following stages:
in the first stage, the bedding directional drilling holes (6) in the drill site (4) are sequentially utilized in the mining process of the stope face (1) to extract the gas in the goaf (7) in a negative pressure mode, so that the gas concentration in the mining process is prevented from exceeding the limit;
and in the second stage, the bedding directional drilling holes (6) are sequentially utilized to inject fire prevention and extinguishing materials into the gob (7) to prevent residual coal in the gob (7) from spontaneous combustion.
It should be understood that the above description is only a preferred embodiment of the present invention, and the present invention is not limited to the above embodiment, and it should be noted that all equivalent and obvious modifications made by those skilled in the art under the guidance of the present specification fall within the spirit scope of the present specification, and should be protected by the present invention.
Claims (4)
1. A method for extracting gas and preventing and extinguishing fire by using bedding directional drilling is characterized by comprising the following steps: drilling a drill site (4) in an air inlet roadway (2) and an air return roadway (3) of a stope face (1), constructing bedding directional drilling holes (6) in a coal bed (5) outside the air inlet roadway (2) and the air return roadway (3) in the drill site (4) respectively, enabling the bedding directional drilling holes (6) to penetrate out of coal walls outside the air inlet roadway (2) and the air return roadway (3), and then performing gas extraction and fire prevention and extinguishing work in a goaf (7) according to the following stages:
in the first stage, bedding directional drilling holes (6) in a drilling field (4) are sequentially utilized in the mining process of a stope face (1), and gas in a goaf (7) is extracted in a negative pressure mode, so that the gas concentration in the mining process is prevented from exceeding the limit;
in the second stage, the bedding directional drilling holes (6) are sequentially utilized to inject fire prevention and extinguishing materials into the goaf (7) so as to prevent the spontaneous combustion of residual coal in the goaf (7);
and the drilling site and the in-layer directional drilling holes are constructed in coal beds outside the air inlet roadway and the air return roadway of the working surface.
2. The method for extracting gas and preventing and extinguishing fire by using the bedding directional drilling hole as claimed in claim 1, wherein the method comprises the following steps: the distance between the drill sites (4) in the same roadway is 50-60 meters, and the drill sites are symmetrically arranged in the air inlet roadway (2) and the air return roadway (3) of the stope face (1).
3. The method for extracting gas and preventing and extinguishing fire by using bedding directional drilling according to claim 1, wherein the method comprises the following steps: 5-6 bedding directional drilling holes (6) are constructed in each drilling site (4), and the horizontal distance between the final hole positions of the bedding directional drilling holes (6) in the same drilling site (4) is 6-10 meters.
4. The method for extracting gas and preventing and extinguishing fire by using the bedding directional drilling hole as claimed in claim 1, wherein the method comprises the following steps: and the vertical distance between every two adjacent bedding directional drilling holes (6) in the drilling field (4) in the same roadway is 0.5-1.5 m.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910632444.XA CN110173295B (en) | 2019-07-13 | 2019-07-13 | Method for extracting gas and preventing and extinguishing fire by using bedding directional drilling |
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| CN201910632444.XA CN110173295B (en) | 2019-07-13 | 2019-07-13 | Method for extracting gas and preventing and extinguishing fire by using bedding directional drilling |
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| CN110173295B true CN110173295B (en) | 2022-07-26 |
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| CN112901247A (en) * | 2021-04-06 | 2021-06-04 | 中国矿业大学 | Coal mine underground multistage sleeve long-distance fire prevention and extinguishing drilling construction method |
| CN112879074A (en) * | 2021-04-07 | 2021-06-01 | 安徽理工大学 | Positive and negative pressure inert injection method and system for rapid fire prevention and extinguishing in goaf |
| CN113586133A (en) * | 2021-09-08 | 2021-11-02 | 中煤科工集团重庆研究院有限公司 | Method for extracting pressure-relief gas from adjacent layer mined by upper protection layer of close-distance thin coal seam group |
| CN113863973B (en) * | 2021-10-27 | 2024-01-16 | 窑街煤电集团有限公司 | Process for implementing nitrogen injection, grouting and fire prevention by arranging drill holes in spontaneous combustion coal bed |
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| SU1145160A1 (en) * | 1983-03-31 | 1985-03-15 | Ордена Октябрьской Революции И Ордена Трудового Красного Знамени Институт Горного Дела Им.А.А.Скочинского | Method of degassing top-worked wide seam |
| CN104696003B (en) * | 2015-01-06 | 2017-04-05 | 中国矿业大学 | A kind of cutting integrated drillingization and vibration heat injection cooperative reinforcing coal bed gas extraction method |
| CN106014475A (en) * | 2016-07-05 | 2016-10-12 | 安徽理工大学 | High-gas coal bed group dip orientation drilling cluster and gas extracting method |
| CN106437825A (en) * | 2016-12-05 | 2017-02-22 | 山西石泉煤业有限责任公司 | Gas extraction method adopting high-level drilling on full-mechanized caving mining face of high gas mine |
| CN108798758B (en) * | 2017-04-28 | 2020-02-04 | 煤科集团沈阳研究院有限公司 | Process for extracting gas from goaf and upper corner along top large-diameter bedding drill hole |
| CN107859530A (en) * | 2017-11-07 | 2018-03-30 | 中国矿业大学(北京) | A kind of ultra close distance coal seam exploitation gas controls method altogether with coal spontaneous combustion |
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